A large, powerful computer system designed to process vast amounts of data and support many users simultaneously. Typically used by large organizations for critical applications.
Compound formed in 1960s computing, from 'main' (primary, chief) and 'frame' (structure, housing). 'Frame' referred to the large metal cabinet that housed the computer components, distinguishing it from smaller systems.
Mainframes are the unsung heroes of modern life - they process credit card transactions, airline reservations, and government records with legendary reliability. Despite being 'old' technology, mainframes handle more transactions per day than all smartphones combined.
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